I have to admit to having a fetish for the Whammy B, as well. It's only real weak point is not it minimal weapon loadout, those two AC10s in chainfire is like a new and improved UAC10(Devs!!!plz don't give it UACs). Anyways its main weak point is armor, but if you run passive all the time (Marshes is great for this mech) you can be quite effective while attracting little attention. It's FTW awesomeness is that it is a dirt cheap heavy that everyone, and I mean everyone, underestimates. I love when a slightly damaged MadCat pilot spots me alone and thinks, ahh WTHeck, one more stravag and I'll RTB.
Shit, one time I ran outta our base on Marshes only to find a Mauler C not far from our base. He couldn't get too close, due to turretrape, so I just used this and a little backpedaling/cover mngt to whittle him down. I had to RTB, right around the corner, but I know for a fact he didn't make it back to base.
Here's a little lesson for all y'all vat borns, never underestimate a Warhammer!!